Hydraulic press especially for producing palate plates



July 27, 1937. u. TOCHTERMANN f -rr AL A 2,088,144

HYDRAULIC-PRESS, ESPECIALLY FOR PRODUCING PALATE PLATES Filed June 26,y1934 M JM Patented July 27, 1937 PATENT OFFICE HYDRAULIC PRESSESPECIALLY FOR PRO- DU CING PALA'IE PLATES Ulrich Tochtermann,Berlin-Steglitz, and Illermann August Kuhlmann, Berlin, GermanyApplication June 26, 1934, Serial No. 732,530 In Germany July 1, 1933 6Claims.

For the manufacture of palate plates, as substitutes for teeth, in thepast, there have been two presses necessary, a hydraulic orspindle-press as cuvette-press for the rst shaping of the plates at thestart and a palate plate press for nishing the roughly formed plates. Inthe latter press a rubber press plate having the shape of the palate andbeing under hydraulic pressure serves to produce the exact lines andmarks of the patients palate.

The well known hydraulic rubber presses are provided with a turningspindle in order to tightly press the form ring and cylinder of therubber press or the holding ring of the rubber press plate against eachother, in order to prevent the rubber press plate from getting out ofits place. Such winding spindles have to bear very high forces andtherefore are very expensive to manufacture.

. The press of the present invention has two pistons one of which isplaced in the upper traverse, the second in a lower traverse of thepress. The direction of movement of the two pistons is against eachother.

As abutment for the body which has tobe eX- posed to pressure anintermediate traverse can be placed which can be swung sideways.

The bodies which are to be exposed to pressure may be for instance testbodies, molds in which masses are shaped or the like.

Each` piston may be moveable singly if desired.

For manufacturing palate plates it is an advantage that the iirstpressing of the starting plates as well as the iinishing pressing of theroughly formed plates can be pressed with the aid of the same pressmachine. When the roughly formed plates are pressed, the form ring andthe holding ring of the rubber press plate can be kept closedhermetically with each other in such manner that the cylinder of thepress piston will have a greater clear cross section than the cylinderwith a rubber disc at its end.

In the drawing the press is shown in two constructions; Figures 1 and 2show the press in the operation of the preforming', that is, as a socalled cuvette press, and Figure 3 the press in the operation of finishpressing of the palate press,v

forming operation. On the cuvette ,f an inserting piece h is placedwhich is formed with its upper part corresponding to the shape of therubber press disc, andlies close against holding ring z' and rubber discd. Instead of using a special inserting piece h the upper part of thecuvette f may be so formed that it corresponds to the shape of therubber press disc and lies close against holding ring i and rubber pressdisc d.

As the cylinder of piston b has a greater clear cross section thancylinder c a metallic contact is attained between the inserting piece hand the holding ring i of the rubber press disc, because at equal fluidpressure the power of the piston b with larger cross section is higherthan the power coming from the rubber press dise with smaller crosssection.

In Figure 2 the parts of cuvette f are pressed together by pumping thefluid through pipe a to piston b whilst the -lead to cylinder c is shutby valve 7c. In this case the cuvette f lies` close against anintermediate traverse m which may be swung around one of the columns I.The intermediate traverse is so constructed that it encloses the uppercylinder c with rubber disc d and transfers the pressure, necessary forpreforming, directly to the upper traverse n. After preforming the plateg the pressure of the pipes is released. When using a press with anintermediate traverse m, this is turned out and valve 7c opened. SeeFig. 3. The form ring o with the cup-shaped hollow form p and thepreformed plate q is placed on the intermediate piece r of sufficientrrnness which lies on press piston b1. Upon application of the pressureiiuid piston` b` lifts itself and brings the form ring o4 with theholding ring z' of the rubber disc d to a metallic close contact. Assoon as the close contact is attained, the pressure is increased to theextent necessary for the nish pressing.

In the rubber press, cover layers, for instance, sponge gold or thelike, may be pressed on the palate plate.

After the nish the pressure is let off and the ready palate plate q istaken out of ring ol.

What we claim is:

1. A hydraulic press having an upper traverse and a lower traverse,pressing devices mounted in said upper and lower traverses respectively,means for directly actuating said pressing devices either alone orsimultaneously with the other by hydraulic pressure for applyingpressure in opposite directions to the work supported by the traverse ofthe lower pressing device between said pressing devices.

2. A hydraulic press having an upper traverse and a lower traverse,pressing devices mounted in said upper and lower traverses respectively,means for directly actuating said pressing devices either alone orsimultaneously with the other by hydraulic pressure for applyingpressure in opposite directions to the work supported by the traverse ofthe lower pressing device between said pressing devices, a movableabutment, movably mounted so as to be moved into position between theupper and lower traverses to serve as an abutment for a mold whenpressure is applied by one of the pressing devices acting singly.

3. A press as claimed in claim 1, wherein one of the hydraulicallyactuated traverses comprises a cylinder having a plunger therein and theother traverse comprises a cup having an inlet for liquid under pressureand a rubber diaphragm forming a die.

4. A press as claimed in claim 1, wherein one of the hydraulicallyactuated pressing devices comprises a cylinder having a plunger thereinand the other pressing device comprises a cup having an inlet for liquidunder pressure and a rubber diaphragm forming a die, said plungersupporting a hollow form for holding the work for one shaping operation,and the hollow form supporting a removable matrix adapted to coact withthe die for another shaping operation.

5. A press as claimed in claim 1, in which one of said pressing deviceshas a cup, an intermediate traverse pivoted adjacent the upper and lowertraverses to be swung across the press between said upper and lowertraverses, said intermediate traverse having a recess receiving the cupwhen the intermediate traverse is so swung, said intermediate traversethen serving as an abutment for the form when the lower pressing deviceacts alone for the forming.

6. A press as claimed in claim 1, wherein one of the hydraulicallyactuated pressing devices comprises a cylinder having a plunger thereinand the other traverse comprises a cup having an inlet for liquid underpressure and a rubber diaphragm forming a die, the bore of the cylinderexceeding the internal cross-section of the cup.

ULRICH TOCHTERMANN. HERMANN AUGUST KUHLMANN.

